* {
  box-sizing: border-box;
}

:root {
  --any-border-radius: 12px;
}

/* ==============滚动条样式===================== */
::-webkit-scrollbar {
  /*高宽分别对应横竖滚动条的尺寸*/
  width: 6px;
  height: 6px;
  scrollbar-arrow-color: red;
}

::-webkit-scrollbar-thumb {
  /*滚动条里面小方块*/
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
  box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
  scrollbar-arrow-color: red;
}

::-webkit-scrollbar-track {
  /*滚动条里面轨道*/
  /* box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2); */
  border-radius: 8px;
  /* background: rgba(0, 0, 0, 0.1); */
}

/* =============================================== */